Air pump



FIG. 1 is a front perspective view of an air pump;

FIG. 2 is a right side view of the air pump;

FIG. 3 is a left side view of the air pump;

FIG. 4 is a front view of the air pump;

FIG. 5 is a rear view of the air pump;

FIG. 6 is a top view of the air pump; and,

FIG. 7 is a bottom view of the air pump.

The broken-line disclosure in the views is understood to represent a portion of the article in which the claimed design is embodied, but which forms no part of the claimed design. 

CLAIM The ornamental design for an air pump, as shown and described. 